Texas Instruments MSP430FR2512IRHLT

Overview

MSP430FR2512IRHLT from Texas Instruments is an ultra-low-power mixed-signal microcontroller with integrated CapTIvate™ capacitive touch sensing for cost-sensitive HMI applications. It features 4 capacitive touch channels (self- or mutual-capacitance), 7.25 KB program FRAM, 2 KB RAM, and operates from 1.8 V to 3.6 V - enabling battery-powered smart locks, elevator buttons, and water-resistant appliance controls.

For engineers reviewing the MSP430FR2512IRHLT datasheet, MSP430FR2512IRHLT pinout, MSP430FR2512IRHLT application, or MSP430FR2512IRHLT equivalent, key selection criteria include its 4-channel CapTIvate capability (vs. 8 on FR2522), VQFN-20 package, <4 µA wake-on-touch current, and IEC-61000-4-2/4-4/4-6 compliance for industrial ESD and noise immunity.

Technical Context

The MSP430FR2512IRHLT implements a dedicated hardware-accelerated CapTIvate module supporting proximity sensing, metal-overlaid touch, and water rejection via spread spectrum modulation and automatic tuning. Its 16-bit RISC CPU runs at up to 16 MHz using an on-chip DCO with ±1% accuracy, while independent clock domains isolate the CapTIvate subsystem to operate in LPM3/LPM4 with only 36 nA shutdown current.

Capacitive sensing is performed on four analog-capable I/O pins (CAP0.0–CAP0.3) referenced to VREG, with built-in noise filtering, debouncing, and environmental compensation - eliminating need for external RC networks or firmware-based signal conditioning in most designs.

Key Specifications

Pinout & Package

VQFN-20 (RHL) package with wettable flanks, 0.4 mm pitch, and thermal pad - optimized for automated optical inspection and thermal dissipation in sealed enclosures.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar capacitive touch microcontroller applications.

Compared with MSP430FR2522IRHLT, the MSP430FR2512IRHLT reduces electrode count to optimize cost and power for simpler interfaces; versus STM32G031K8T6, it delivers superior noise immunity and lower wake current without firmware overhead - critical for battery-operated, safety-certified HMIs.

Availability

MSP430FR2512IRHLT is available at Aetrix Electronics and suitable for smart lock keypads, elevator call panels, and appliance control panels requiring stable component supply across multi-year production cycles.

Supply support for MSP430FR2512IRHLT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, energy efficiency, and system integration.

The MSP430FR25x2 product line targets ultra-low-power human-machine interface applications - specifically engineered to replace mechanical switches and resistive touch in industrial, building automation, and consumer appliances with certified, autonomous capacitive sensing.

FAQ

What is the maximum number of capacitive touch channels supported by the MSP430FR2512IRHLT?

The MSP430FR2512IRHLT supports up to 4 capacitive touch channels - configurable as either self-capacitance or mutual-capacitance electrodes. This is confirmed in the device comparison table and functional block diagram, distinguishing it from the 8-channel MSP430FR2522IRHLT. All 4 channels (CAP0.0–CAP0.3) are implemented on P1.4–P1.7 and fully functional in the RHL package. The CAP1.x pins are present but reserved and non-operational on the MSP430FR2512IRHLT.

Does the MSP430FR2512IRHLT require external components for basic capacitive touch operation?

No, the MSP430FR2512IRHLT does not require external RC networks or dedicated touch controller ICs for basic operation. Its integrated CapTIvate module provides hardware-accelerated electrode scanning, spread spectrum modulation, automatic tuning, and noise filtering. Only a 1 µF capacitor on VREG and standard DVCC/DVSS decoupling (0.1 µF + 4.7–10 µF) are mandatory per the datasheet. Electrode traces connect directly to CAP0.x pins with no series resistors or parallel capacitors needed in typical implementations.

What is the wake-on-touch current specification for the MSP430FR2512IRHLT?

The MSP430FR2512IRHLT achieves <4 µA wake-on-touch current with two active capacitive sensors, as specified in the "Features" section and verified in Section 5.7 (Low-Power Mode Supply Currents). This current is measured in LPM3 or LPM4 mode with the CapTIvate module active and CPU asleep - enabling multi-year battery life in applications like wireless doorbells and smart locks. The value assumes default CapTIvate settings and 1.8 V supply; actual current may vary slightly with electrode count and scan interval configuration.

Is the MSP430FR2512IRHLT pin-compatible with the MSP430FR2522IRHLT?

Yes, the MSP430FR2512IRHLT is pin-compatible with the MSP430FR2522IRHLT in the VQFN-20 (RHL) package - sharing identical footprint, power pins, debug interface, and peripheral mappings. However, CAP1.0–CAP1.3 pins (P1.0–P1.3) are physically present but functionally disabled on the MSP430FR2512IRHLT, while they are active touch inputs on the MSP430FR2522IRHLT. PCBs designed for the FR2522 can host the FR2512 without layout changes, though firmware must exclude CAP1.x usage.

Which IEC electromagnetic compatibility standards are validated for the MSP430FR2512IRHLT?

The MSP430FR2512IRHLT is validated to IEC-61000-4-2 (15 kV contact / 20 kV air-gap ESD), IEC-61000-4-4 (4 kV electrical fast transients), and IEC-61000-4-6 (10 V RMS common-mode conducted noise). These certifications are explicitly stated in the "Features" section and confirmed in the "Description" - enabling designers to meet Class B industrial immunity requirements without additional system-level filtering or shielding in most cases.